Choosing for more soft contrast Which 3514 serial to choose for

[grind]

I'm planning to buy an M7. And i want to strart with an 35/1.4 Summilux.

I read everywhere that the Asph lenses have an sharp lapse of contrast. And the pre-Asph lenses have an more beautifull soft contrast.
This is why i choose for pre-Asph lense. Can anybody advise me which lens/ serial i've gotta choose for?